Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
quang toan » quang tuan, quang tran, quang doan
dieu danh » tieu danh, dia danh, dien anh
toan tap » toan ban
hanh va » hang va, hanh vi
va quan » van quan, tac quan, hai quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((dieu hanh) or (dieu danh)) - hanh va quan ((nhung cong) OR (thong cong)) quang toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((dieu hanh) OR (dieu danh)) - hanh va quan ((nhung cong) OR (thong cong)) quang toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((dieu hanh) or (dieu danh)) - hanh va quan ((nhung cong) OR (thong cong)) quang toan tap".
• Adding a wildcard symbol may retrieve word variants: theo ((dieu hanh) or (dieu danh)) - hanh va quan ((nhung cong) OR (thong cong)) quang toan tap*.